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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19670 results found.

  1. GRB 190829A: Liverpool Telescope observations
  2. GRB 190829A: Liverpool Telescope optical photometry
  3. GRB 190829A: MMT detection of the optical afterglow
  4. GRB 190829A: No Neutrino Counterpart detected with ANTARES
  5. GRB 190829A: KAIT Detection of the Optical Afterglow
  6. GRB 190829A, Swift-BAT refined analysis
  7. GRB 190829A: AGILE-GRID upper limits
  8. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  9. GRB 190829A: Fermi GBM detection
  10. GRB 190829A: Fermi-LAT Upper Limits
  11. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  12. GRB 190829A: Swift/UVOT detection of an optical afterglow with a rise
  13. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  14. GRB 190829A: Swift-XRT refined Analysis
  15. GRB 190829A: Enhanced Swift-XRT position
  16. GRB 190829A: 10.4m GTC spectroscopy
  17. GRB 190829A: NOT optical afterglow detection and spectroscopy
  18. GRB 190829A:: MASTER-net bright and decay OT detection
  19. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  20. GRB 190828B: VLT/X-shooter optical afterglow candidate
  21. GRB 190828B: Swift-XRT refined Analysis
  22. LIGO/Virgo S190814bv: Swift observation of ASKAP J005547-270433/AT2019osy
  23. GRB 190828B: Swift/UVOT Upper Limits
  24. GRB 190828A: Swift-XRT observations
  25. GRB 190823A: AstroSat CZTI detection
  26. GRB 190828B: Fermi GBM observation
  27. GRB 190828B: Swift-BAT refined analysis
  28. LIGO/Virgo S190828l: no counterpart candidates in the Swift/BAT Observations
  29. LIGO/Virgo S190828j: no counterpart candidates in the Swift/BAT Observations
  30. GRB 190828A: Tiled Swift observations
  31. LIGO/Virgo S190814bv: Swift UVOT - no new counterpart candidates identified
  32. GRB 190828B: Enhanced Swift-XRT position
  33. Swift GRB190828.54 Global MASTER-Net observations report
  34. GRB 190828B: Swift detection of a burst
  35. GRB 190824A, Swift-BAT refined analysis
  36. GRB 190824A: Swift/UVOT Upper Limits
  37. GRB 190823A: Swift-XRT observations
  38. GRB 190816A: Swift-XRT afterglow detection
  39. GRB 190824A: Swift-XRT refined Analysis
  40. GRB 190824A: Fermi GBM observation
  41. GRB 190824A: Enhanced Swift-XRT position
  42. GRB 190821A: Swift-BAT refined analysis
  43. GRB 190824A: Swift detection of a burst
  44. GRB 190823A: Tiled Swift observations
  45. GRB 190821A: Swift/UVOT Upper Limits
  46. GRB 190821A: MASTER VWFC syncronous optical observations
  47. GRB 190821A: Swift-XRT refined Analysis
  48. GRB 190821A: Enhanced Swift-XRT position
  49. GRB 190821A: Fermi GBM observation
  50. Fermi GBM-190816: Upper Limits from Swift/BAT Observations
  51. GRB 190821A: MASTER do not see any afterglow candidate
  52. GRB 190821A: T60 Les Makes optical detection of the afterglow
  53. Swift GRB190821.72 Global MASTER-Net observations report
  54. GRB 190821A: Swift detection of a burst
  55. LIGO/Virgo GBM-190816: no counterpart candidates in the Swift/BAT Observations
  56. IceCube-190819A: MASTER analysis
  57. GRB 190816A: Swift-BAT refined analysis
  58. LIGO/Virgo S190814bv: No strong counterpart candidates in Swift/XRT observations
  59. GRB 190816A: Swift-XRT observations
  60. GRB 190816A: Swift detection of a burst
  61. LIGO/Virgo S190814bv: no counterpart candidates in Thacher imaging
  62. LIGO/Virgo S190814bv: No counterpart candidates in the Swift/BAT Observations
  63. IPN triangulation of GRB 190805B
  64. IPN triangulation of GRB 190810A (short)
  65. HAWC-190806A: Swift-XRT observations
  66. Correction to Swift GCN 25303
  67. Trigger_11505: Tiled Swift observations
  68. GRB 190805B: AstroSat CZTI detection
  69. GRB 190804B: Swift-XRT afterglow detection
  70. GRB 190805B: Swift-XRT observations
  71. GRB 190805B: Tiled Swift observations
  72. GRB 190804B: Swift-XRT observations
  73. GRB 190804B: Tiled Swift observations
  74. GRB 190731A: AstroSat CZTI detection
  75. GRB 190731A: Swift/UVOT Upper Limits
  76. GRB 190731A: no OT detected by MASTER
  77. GRB 190731A: Swift-XRT afterglow detection
  78. IPN Triangulation of GRB 190731A
  79. GRB 190731A: Swift ToO observations
  80. GRB190731A: Fermi-LAT detection
  81. LIGO/Virgo S190728q/IceCube neutrino candidate: No counterpart candidates in the Swift-XRT Observations
  82. Konus-Wind observation of GRB 190727B
  83. GRB 190727B: Swift-BAT refined analysis
  84. LIGO/Virgo S190728q: No counterpart candidates in the Swift/BAT Observations
  85. GRB 190727B: Fermi-LAT detection
  86. GRB 190727B: Fermi GBM observations
  87. GRB 190727B: Swift detection of a burst
  88. LIGO/Virgo S190727h: No counterpart candidates in the Swift/BAT Observations
  89. LIGO/Virgo S190718y: Swift XRT observations, 45 X-ray sources
  90. LIGO/Virgo S190720a: Thacher Observatory follow-up observations
  91. GRB 190719C: Fermi GBM detection
  92. GRB 190719C: Swift-BAT refined analysis
  93. GRB 190719C: Swift/UVOT Upper Limits
  94. LIGO/Virgo S190720a: No counterpart candidates in the Swift/BAT Observations
  95. GRB 190719C: Swift-XRT light-curve fit
  96. GRB 190719C: Swift-XRT refined Analysis
  97. GRB 190719C: NOT candidate optical afterglow and host
  98. GRB 190719C: Swift detection of a burst
  99. GRB 190718A: Swift-BAT refined analysis
  100. LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations

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